Draggables don't drag

This is such a minor issue I feel badly creating a new topic for it but: occasionally things that are supposed to be draggable aren't draggable in Vivaldi, at least for me? Tumblr tags (which in most browsers you can drag to reorder, when editing a post) are the example that comes to mind, but I'm pretty sure I've run into it elsewhere as well. Worth a bug report?